Fluid-pressure-operable relay valves

Details Fluid-pressure-operable relay valves Fluid-pressure-operable relay valves

1981-06-17

1984-03-20

Nilson, Robert G.

Fluid handling

Pressure modulating relays or followers

With counter-balancing pressure feedback to the modulating...

1376275, F16K 1114

Patent

active

044374836

ABSTRACT:
In a fluid-pressure-operable relay valve a control piston works in a bore in the valve housing to control sequential communication between an inlet port and an outlet port, and between the outlet port and an exhaust port. An exhaust valve seating on the control piston is engageable with an exhaust valve member coupled to one end of a lever pivotally mounted in the housing, and a spring acts on the exhaust member to urge an inlet valve member towards an inlet seating surrounding the inlet port. Since the spring acts in opposition to fluid pressure at the inlet port, a relatively small `cracking force` is required to the urge the inlet member away from the inlet seating to open the inlet valve.
In alternative constructions the inlet and exhaust members are combined into a single valve member which is urged directly by the spring towards the inlet seating.

REFERENCES:
patent: 3818944 (1974-06-01), Taft
patent: 3833272 (1974-09-01), Farr
patent: 4096884 (1978-06-01), Horowitz
patent: 4126152 (1978-11-01), Kirk

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